Balance-shaft for watch-movements.



J. A. MEROZ.

BALANCE SHAFT FOR WATCH MOVEMENTS.

APPLICATION FILED 11110.23, 1913.

1, 1 1 3,459. Patented 001.13, 1914.

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THE NORRIS PETERS CO..PHGTO-LITHO 1\VASHINCTON, r

JOHN A. MEROZ, 0F VVALTHAM, MASSACHUSETTS.

BALANCE-SHAFT FOR WATCH-MOVEMENTS.

Specification of Letters Patent.

Application filed December 23, 1913.

Patented Oct. 13, 1914. Serial No. 808,318.

To all whom it may concern Be it known that 1, JOHN A. Munoz, a citizen of the Republic of Switzerland, residing at \Valtham, in the county of. Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Balance-Shafts for atch-Movements; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in balance shafts for watch movements and has for its object the provision of a novel combination and arrangement of parts which will permit the removal of the roller carrying the jewel pin without disarranging the remaining portion of the balance mechanism.

Another object of the invention is to provide a novel arrangement of parts by which a double roller may be secured to and used in connection with the balance shaft and which may be easily and quickly removed without bending the balance arm or disarranging any of the remaining portions of the balance mechanism.

A further object of the invention is to provide a device wherein the proper adjustment of the several elements serving to make up the whole is insured and the bending or breaking of the balance shaft is eliminated.

With the above and other objects in View the invention consists of the following combination and arrangement of parts which will be clearly set forth in the accompanying specification and drawings, in which,

Figure 1 is a transverse sectional view of a balance shaft showing my improved method of mounting the roller bearing table thereto, Fig. 2 is a bottom plan view of Fig. 1, Fig. 3 is a transverse sectional view of the construction used in mounting a double roller, and Fig. 4 is a bottom plan View of the safety roller which is used when the construction illustrated in Fig. 3 is desirable.

Reference being had more particularly to the drawings the numeral 1 indicates a portion of the balance shaft to which the roller table, indicated generally by the numeral 2, is secured. This balance shaft 1 preferably comprises the enlarged cylindrical portion 3 to which the balance wheel is secured. A

suitable collar 1 is formed integral with the cylindrical portion 3 of the balance shaft and is adapted to form the lower abutment for the hub of the balance wheel when the same is in place. A suitable reduced portion 5 is formed integral with the balance shaft and projects longitudinally with relation to the axis thereof. This reduced portion 5 is provided with the usual end bearing 6 which is adapted to be held in the frame of the watch movement when the device is in use.

The roller table referred to by the numeral 2 preferably comprises the elements 7 and 8. The element 7 is preferably a disk having formed integral therewith the concentric collar 9 which is externally screw threaded as will be clearly seen upon referring to Figs. 1 and 3 of the drawing. The element 8 is preferably a suitable disk having a centrally located aperture 10 formed therein which communicates with the circular concentric recess 11 in which the element 7 is adapted to rest when the device is in use. Suitably secured near the periphery of the disk 8 is provided the usual jewel pin 12 with which the balance lever of the watch mechanism cooperates, thereby causing the oscillation of the balance wheel. A pair of diametrically disposed apertures 13 and 14: are formed in the disk 8 to permit of the insertion of a tool especially constructed to remove the disk 8 from its position with relation to the remainder of the elements making up the balance mechanism.

In the modified form of the invention which is best illustrated in Figs. 3 and 4: the disk 7 is constructed in a manner similar to the one illustrated in Fig. 1 with the exception that the collar 9 is extended as clearly illustrated by the numeral 15, while the construction of the disk 8 remains substantially the same. The extension 5 on the balance shaft is preferably provided with the annular recess which is indicated by the numeral 16. The safety roller which is indicated generally by the numeral 17, preferably comprises the disk 18 having formed integral therewith the upstanding internally screw threaded collar 19 which is adapted to cooperate with the collar 15 formed on the disk 7 to hold the device in its assembled position. The disk 18 is preferably provided with the centrally located aperture 20 which communicates with the concentric recess 21 as clearly shown in Fig. 3. The aperture 20 is arranged to receive the end of the balance shaft which projects downwardly as clearly shown. A pair of diametrically opposed apertures 22 and 28 are formed in the safety roller and are for the same purpose as the apertures 13 and 1% formed in the disk 8.

It will be clearly seen from the foregoing that in assembling the device the disk 7 is placed over the end 5 of the balance shaft and is so arranged as to frictionally engage the same and thereby be held from rotation. The disk 8 is next threaded upon the collar 9 and the same will be held from movement thereon. In the construction illustrated in Fig. 3, when it is desired to use the safety roller indicated generally by the numeral 17 the device is assembled as previously described, excepting that the collar 19 on the disk 18 is threaded on the extension 15 of the collar 9, thereby holding the whole firmly together. Should it be desirable at any time to remove the parts for repairing or adjustment it will be evident that by inserting a tool particularly constructed for such use in the apertures 13 and 14 of the disk 8 the same may be unscrewed from its position on the collar 9 and the parts disassembled thereby permitting the several members to be adjusted.

While in the foregoing I have shown and described the preferred embodiment of the invention 1' wish it to be understood that I may make such changes in the combination and arrangement of parts as fall within the scope of the appended claims.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, I). C.

hat is claimed is 1. In combination with the balance shaft of a Watch, a disk frictionally secured thereto, a collar formed on said disk, said collar being externally screw threaded, and a sec- 0nd disk of larger diameter than the first mentioned disk and of substantially twice the thickness, said second mentioned disk having an internally screw threaded aperture adapted to fit the externally screw threaded collar and be held thereto, and a roller jewel mounted in the second mentioned disk.

2. In combination with the balance shaft of a watch, a reduced portion formed thereon, a disk secured to the reduced portion, an externally screw threaded collar formed integral with the disk, a second disk of greater diameter than the first mentioned disk, said second disk having an internally screw threaded aperture centrally located with relation thereto, said second disk also having a centrally located concentric recess adapted to receive the first mentioned disk, a jewel pin carried by the second mentioned disk, and a safety roller threaded on the collar on the first mentioned disk and adapted to cooperate with the second mentioned disk in the operation of the watch movement.

In testimony whereof I my signature in presence of two witnesses.

JOHN A. MEROZ. Witnesses:

CHARLES Gr. STEVER, HOWARD E. Cons. I 

